Chemistry => Thermochemistry => Exothermic and Endothermic Processes
The type of chemical reaction will depend on whether the reaction absorbs or releases energy.
When the reaction releases energy, it is because there is an excess of it and it is called exothermic. This excess occurs because the energy of the products is lower than that of the reactants.
Now, when the products have more energy than the reactants, it means that the reaction needs energy since there is a lack of energy. We call these types of reactions endothermic.
Now, according to the establishment, if the reactants have less energy (or enthalpy), it means that heat must be adsorbed in order to obtain the products that have higher energy (or enthalpy).
Therefore, the answer will be:
B. heat energy is absorbed